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| author | Tony Lindgren <tony@atomide.com> | 2010-08-02 14:23:38 +0300 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2010-08-02 14:23:38 +0300 |
| commit | 055a1b8c9927bc587f293020a54c6cd8e24dfac0 (patch) | |
| tree | db7c8d00931180c4896c9e00d2cb506939592cda /arch/x86/kernel/acpi/cstate.c | |
| parent | 8a6f7e14fc3b3ea911838c3f4ce137cb8a3d134a (diff) | |
| parent | f535daed925c2d3c1db06b06a63c4955f2c51988 (diff) | |
Merge branch 'devel-misc' into omap-for-linus
Diffstat (limited to 'arch/x86/kernel/acpi/cstate.c')
| -rw-r--r-- | arch/x86/kernel/acpi/cstate.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c index 2e837f5080f..fb7a5f052e2 100644 --- a/arch/x86/kernel/acpi/cstate.c +++ b/arch/x86/kernel/acpi/cstate.c @@ -145,6 +145,15 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu, percpu_entry->states[cx->index].eax = cx->address; percpu_entry->states[cx->index].ecx = MWAIT_ECX_INTERRUPT_BREAK; } + + /* + * For _CST FFH on Intel, if GAS.access_size bit 1 is cleared, + * then we should skip checking BM_STS for this C-state. + * ref: "Intel Processor Vendor-Specific ACPI Interface Specification" + */ + if ((c->x86_vendor == X86_VENDOR_INTEL) && !(reg->access_size & 0x2)) + cx->bm_sts_skip = 1; + return retval; } EXPORT_SYMBOL_GPL(acpi_processor_ffh_cstate_probe); |